made TabItem open and changed deferred to isDeferred

Sources/iOS/Grid.swift

@@ -82,7 +82,7 @@ public struct Grid {
     internal weak var context: UIView?
     
     /// Defer the calculation.
-    public var deferred = false
+    public var isDeferred = false
     
     /// Number of rows.
     public var rows: Int {
@@ -179,18 +179,18 @@ public struct Grid {
     
     /// Begins a deferred block.
     public mutating func begin() {
-        deferred = true
+        isDeferred = true
     }
     
     /// Completes a deferred block.
     public mutating func commit() {
-        deferred = false
+        isDeferred = false
         reload()
     }
     
     /// Reload the button layout.
     public func reload() {
-        guard !deferred else {
+        guard !isDeferred else {
             return
         }
         

Sources/iOS/TabsController.swift

@@ -40,8 +40,9 @@ public enum TabBarAlignment: Int {
 }
 
 extension UIViewController {
-    /// tabItem reference.
-    @objc open private(set) var tabItem: TabItem {
+    /// TabItem reference.
+    @objc
+    open private(set) var tabItem: TabItem {
         get {
             return AssociatedObject.get(base: self, key: &TabItemKey) {
                 return TabItem()